2x+3=9
2x=9-3
2x=6
2x/2=6/2
X=3
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Presumably you want to know the value of x 2x + 3 = 9x 3 = 9x - 2x 3 = 7x 3/7 = x So x = 3/7
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
(2x + 3)(2x + 3)
x=3
2x + 3 = 92x = 9 - 32x = 6x = 6/2x = 3
If: x+9+5x = 21+2x Then: x = 3